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It does not sound like a fuel pressure regulator to me (it takes fuel pump a split second to restore the pressure). It does not sound like a leaking injector either (4-8 hours should be long enough for any leaks to have the effect).
Temperature sensor sounds like a reasonable suspect.
Two hours of labor for the coolant sensor seems a bit excessive.
Unless they include time to diagnose the problem in this quote.
The temperature sensors are accessible from the top of engine compartment - you should be able to replace them yourself and do it in about 15 minutes.
However I doubt the sensor would go bad just from sitting for 7 weeks. Most likely it is an electrical connector - take an ohmmeter and check the sensors. SVX utilizes 2 temperature sensors - one for ECU, the other one for the temp gauge. This is a bit unfortunate - you cannot diagnose bad sensor by just looking a the temp gauge.
Take the connectors off the sensors, measure the resistance - should not be short, should not be open, should be single KOhms depending on the temperature.
Decent ohmmeter is around $20 at radioshack.
Put the connectors back and hope you problem is fixed :-)
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